Snowplow



Jan. 27, 1925. 1,524,518

J. C) JCJFHQSCDN SNOWPLOW Filed Aug, 23, 1923 2 Sheets-Sheet 1 Jv/mTa/mama J. O. JOHNSON SNOWPLOW Filed Aug. 23, 1923 2 Sheets-Sheet 2gwuentoz Jb/n 0. J /mm/n Patented Jan. 27, -1925.

UNITED STATES JOHN O. JOHNSON, F WHITE BEAR LAKE, MINNESOTA.

SNOWPLOW.

Application filed August 23, 1923. Serial No. 658,934.

To all whom it may concern.-

Be it known that I, JOHN O. JOHNSON, :1 citizen of the United States,residing at White Bear Lake, in the county of Ramsey 5 and State ofMinnesota, have invented certain new and useful Improvements inSnowplows, of which the following is a specification. My inventionrelates to snow plows, 0 adapted to be attached to tractors, an obect ofthe invention being the provision of improved snow handling and plowingmeans, adapted to be driven by the motor of the tractor, and includingsnow expel- .5 ling devices, whereby thesnow may be arbitrarily plowedup and thrown either to the right or left of the road, orboth, asdesired, improved novel controllin means being provided whereby the snowt rowing :0 mechanism on either side of the center line of the tractormay be arbitrarily rendered inoperative.

A further object of the invention is the provision of a power drivensnow plow, :5 embodying plow mounting and controlling devices of novelconstruction, whereby the plow is enabled toyield vertically whendriving over uneven ground, and whereby a large part of the stresses orforces de- 1 veloped by impact of the plow with the snow and ice, aretransmitted directly to rhe rear portion of the tractor to utilize theweight of said tractor portion as "ballast, to avoid the tendency oflifting the front of the tractor when the nose of the plow digs into abank of snow or under a led e of ice.

ther objects and advantages of my invention will be pointed out asthisspeci m fication progresses, the invention consist; ing in theconstruction, combination, and

arrangement of parts hereinafter described.

- and claimed. y

In the accompanying drawings, forming part of this specification:

Figure 1, is a side elevation. of a snow plow embodying my invention,shown in. section on line 11 of Figure 2.

Figure 2, is a view of the top of same. Figure 3, is a fragmentary sideview of one of the fan wheels.

Figure 4, is a vertical longitudinal section on line 4-4 of Figure 2.

.ures 1 and 2.

Figure 5, is a fragmentary perspective vlew of a part of the controllingmechanism for controlling the snow expelling devices.

Figure 6, is a fragmentary perspective view ofa part of the low mountingmechanism, whereby part of the forces developed in a plowing action areapplied to the rear of the snow ploW.

dicating several positions assumed by the plow controlling parts.

Figure 11, is a side view of a detail; and Figure 12, is a perspectiveView of the plow unit, parts thereof being omitted.

In the drawings, I have shown my invention attached to a track layingtractor'of the internal combustion type, and more specifically to atractor known as the Cletrack or Cleveland tract-or, it beingunderstood, however, that my invention may be applied to any suitabletype of tractor, whether of the track laying or ordinary g" tractiontype, by slightly modifying the means of connection therewith, withoutdeparting from the spirit of the invention.

The tractor shown comprises a truck portion, or, in other words, awheeled portion including the traction mechanism, and a main frame,pivotally mounted upon said wheeled portion, can'yingfthe power plant ormotor. i

This tractor embodies a peculiar construction, whereby the main frame,designated generally by the numeral 2, is pivotally mounted upon therear axle 3 '(which is made of two sections), and spaced an appreciabledistance above the latter, in a manner to swing in a verticallongitudinal plane with respect to the center line of the tractor.

The wheeled portion comprises a pair of similar side frames 4, at therear portion 105 of which are carried, respectively, the rear tractionwheels 5, by means of the shaft 4 sections 3, which latter are firmlyheld by boxes 3. Journaled, res ctively, in the forward portion of saidof the journals 4', are the forward traction wheels 6, thetr-actionwheels of each frame being operatively engaged by an endles flexibletraction belt 7, here shown diagrammatically, the links thereof notbeing 1ndicated.

The manner of driving the tractor may be briefly described as follows:The rear traction wheels 5 are each formed with an internal gear 8 whichmeshes, respectively, with one of the pinions 9, carried by thedifferential shaft 10, said shaft extendin through the differentialhousing 11 beyon opposite ends thereof.' The h0us1 cured to the mainframe 2,, as diagrammatically shown in Figure 9, and constructivelyshown in Figure 2, and is pivotally supported by means of bearings 13,respectively, on the shafts 3, to enable the main fijame to be swung ina vertical longitudmal plane with respect to the center line of thetractor. At its front end, the frame is supported on the side frames 4by means of a semi-elliptic spring 14, to lend resiliency to thestructure. This spring has suitable connections (not shown) at 16,respectively, with the side frames 4. Thus, the front end of the mainframe is enabled to vibrate vertically about the shafts 3, as

indicated by the dotted lines in Figure 9, stabilizing irons 15 beingprovided to serve as guides to maintain the frame relatively positionedwith respect to the wheeled portion of the tractor.

In the tractor shown, the rear drivers rotate on the.axles 3, the latterbeing firmly held, as stated'in the foregoing, in the traction frameconstituted by the side frames 4 and-the spring 14. In Figure 2, 17designates the motor, 18 the drive shaft, 18 the steering wheel, and 18"the seat.

To stabilize the frame against lateral displacement, guide members 15are provided, there being one on each side of the frame. These guidemembers slide vertically in the sockets 15, secured one to the inneredge of each of the frames 4.

Extending downward from the under side of the housing, are the brackets13 and 19, there being two on either side of the center line of thetractor, as shown by dotted lines in Figure 2 of the drawin s. Thesebrackets support, respectively, t e axles 3, which latter are inlongitudinal alinement endwise. Thus, an available portion of shaft ishad, on either side of the center of the tractor between the brackets 13and 19, as at 20 (Figure 2), to be utilized ames by, means is se-.

by means of bolts 20 upon the 'inner side of each of the side rails 2'of the main frame, a forwardly extending supporting bar 21, said barshaving pivotal connection, respectively, by means of horizontallydisposed pivot bolts 22, with a pair of links 23. The links are paralleland extend forwardly and downwardly to the inner sides, respectively, ofa pair of mold boards 24 and are joined together at the center of thetractor to form a central rearwardly inclining ridge 24, the mold boardsconstituting a major portion of a plow unit, generally designated by thenumber 25.

Secured, respectively, at suitable points to the inner sides of the moldboards, one for each of the links 23, arebrackets 26, each bracketformed with a bifurcation extending parallel with the center line of thetractor and carrying a transversely disposed, horizontal pivot pin 27,extending through said bifurcation and through an opening 28 in theouter end of each of the links 23, which latter extend loosely into thebifurcation of the brackets, whereby the plow unit is pivotallyconnected to the main frame of the tractor, to swing in a verticallongitudinal plane thereon.

The plow unit 25 carries a pair of laterally alined horizontallydisposed pivot bolts 29, arranged parallel with the pivot bolts 22 andapproximatel in vertical alinement therewith. Pivotal y supported, oneon each of the pivot bolts 29 and extending rearwardly and upwardly and,respectively, to and beyond the axles 3, are the strut or brace bars 30.The rear end of each of these bars is formed with a flat, upper plate31, which slidably engages, respectively, the tops of the axles 3.approximately at the point 20 (Figure 2), so that the strut bars may beslid longitudinally thereon.

Slidably secured, one to each of the brace bars 30, as by means of bolts32 to slide longitudinally thereon, is an adjustment plate 33, the end33 thereof extending at ri ht angles to the plate 31 and bein adapte toengage with the axles 3. The late is formed with slotted bolt holes 34,wlereby, when said bolts are slackened, the plate may be adjustedlongitudinally of the brace member to change the relative sition of heend or shoulder 33. By t is adjustment means, the distance between thepivots 29 and the shoulder is rendered variable for a purpose to behereinafter explained.

adapted to loosely receive a threaded nut 36, in which is threaded theshank 37 of an upwardly extending adjustment crank screw, generallydesignated by the numeral 38. v

The adjustment screws pass respectively through openings 39 in the topand bottom walls of the socket 35 and loosely through openings 39 in thelinks 23. The screws are further formed with vertically spaced shoulders41, betweenwhich, respectively, the horizontal webs of the links 23loosely fit. The screws are each further formed with a crank handle 40.By the actuation of the screws, the pivots 29 may be raised or loweredto the desired level with respect to the ground. Extendingtransverselyof the tractor, through openings 42 of the mold boards 24,is the shaft housing 43, having flanges 44, one adjacent each endthereof, said flanges fitting snugly respectively against the moldboards, and being firmly bolted thereto.

Journaled in the housing, by means of the bearings 43, are the shafts45, each carrying rigidly at its outer end a fan wheel 46, having a hubformed with a peripheral groove 46'. Midway between its ends, thehousing is enlarged to form a gear chamber 47 having oppositely disposedjournal bearings 47, which bearings axially aline with the shafts 45,and rotatably support respectively the ends of the hub 47 of a bevelgear 48. Each of the ends of the hub is formed with a socket 499,preferably rectangular in cross section to freely receive the squared'inner ends 45 of the shafts 45. liy sliding either of the shafts 45outwardly endwise, either may ,be disengaged from its respective socket,to thus render the shafts incapable of being rotated by the gear. Forthe purpose of arbitrarily sliding either of the shafts endwise out ofengagement with the gear, each end of the shaft housing is similarlyconstructed and equipped. Each end is'formed with a lug having a bore 49extending parallel with the shafts 45, wherein is slidably mounted a rod49, carrying at its outer end a composite separable link 49", which linkis adapted to be inserted in the groove 46 to surround the hub of thefan wheel, to enable the latter to rotate freely therein. Thus, alongitudinal movement of the rod- 49 will result in bodily moving thefan wheel, outward and disconnecting its shaft 45 from the driven gear48. For the purpose of enabling the oper ator to throw into or out ofgear either of the fan wheels 46, from his position on the seat 18", Iprovide for each fan wheel a shifting rod 50, having a suitable handle50, and being formed with a flat eye 51 at its front end. This eye(Figure 5) is movably positioned between a pair of lugs 51 of a shiftingbracket, having a pivot pin 51 extending through said eye, and a stud51" rotatably fitting in a hub 52, preferably integral with the housing43. The shifting bracket has a downwardly extending lever arm 52 havingpivotal connection 52" with a link 53, which link has pivotalconnection53 with the shift rod 49.

By actuating the handle :50 to rotate the rod 50, obviously either ofthe fan wheels may be thrown into gear. Journaled by means of thebearing 53 in the housing 43, is a shaft 54, extending at right anglesto the shafts 45, and carrying a pinion 55 in mesh with the gear 48. Theshaft 54 carries rigidly, as by means of a set screw 55 at its rear end,a universal shaft connection 56, which in turn is rigidly connected bymeans of a set screw 56 to the motor shaft 18.

The universal connection comprises two substantially similar connectingmembers 57, each having oppositelydisposed lugs 57, which lugs are intransverse overlapping relation, each pair of lugs carrying a pivot bolt57 between them, which pivot bolt has rigid connection, with a ball 58.

It will be noted, that the center of the pivot bolts 57", or the ball58, are located coincident laterally with the pivots 22, so that theplow unit 25 may be bodily swung vertically about said pivots anduniversal joint. As the pivots 29 are carried by the plow unit by meansof the extension bars 59, which bars are firmly secured by means ofbolts 59 to the mold boards and the cross member 59", it will beapparent that the strut members 30- (Figures 1, 6, and 12) will be incompression, inasmuch as the weight 2 of the plow unit develops a pullin the links 23, thus placing these in tension, said unit tending tofall forwardly and downwardly because of the pivotal connections 27between-the links and the mold boards. However, the rear of the plowunit is supported in elevated position by and suspended on the mainframe 2, by the adjustment screws 38. Ubviously, the plow unit in itsdescent to the ground, must rotate about the pivots 22, and, therefore,in such rotation, tend to swing the pivots 29 rearward, as the latterare situated a considerable distance below the center of rotation. Arearward movement, however, of the pivots 29 is opposed by the struts30, which latter abut against the rear axles 3 with their shoulders 33',thereby transmitting the forces due to the impact of the nose of theplow with the snow, through the extension bars 59 and the struts.

By means of the adjustment afforded by the plates 33 of the struts, asdescribed in the foregoing, I am enabled to so adjust the effectivelength of the struts, as to bring the lower edge of the plow unitparallel with the roadbed, as indicated in Figures 1 vas said verticalplane corresponds ,to the base of a triangle of which the pivots 27 formthe apex, it will be apparent that the pivots 29 will move anappreciably greater distance downward with each turn of the handles 40,than will the pivots 27. This 'lifi'erence in travel of the pivots willcause the front of theplow unit to travel a lesser distance than therear thereof, inasmuch as the pivots 27 are located at the front por-'tion of the mold boards. This is clearly" illustrated in diagram 10,wherein the pivots 29 have rotated about the axles 3, from the positionshown in solid lines to that indicated by the fine dotted lines. Thepivots 27, in the diagram, it will be noted, are wpparated less thanhalf the distance between t 1e is raised at its nose and lowered at therear, but it is at times desirable to change the distance between theroadbed and the parallel lower -edge of the plow unit. To accomplishthis, I have provided the adjustment plates 33, at the. rear ends of thestruts. The plates 33 may be adjusted until the struts are of properlength to raise the plow to the desired height. The plow unit may thenbe leveled with the road bymeans of the adjustment screws 38. As themain frame vibra-tes more or less vertically, theshifting rods 50 areprovided with a rotatable joint constituted in the pivot pins 51", sothat the rod may bend in unison with the vibrations of the frame.

The mold boards 24 inchne rearwardly and converge forwardly, and extendlaterally a distance beyond the side of the tractor. The forward surfaceof the mold boards is somewhat arcuate in form and is gradually extendedcircumerentially as the boards recede from the median ridge 24, to formsemi-circular, oppositely disposed, laterally opening discharge funnels60, the outer rims of the funnels being preferably in vertical parallelplanes.

The fan wheels may be described as being formed with radial, outwardlyand rearwardly pitched blades 61, triangular in shape, the peripheralinner corners of the blades being cut away to conform to the angle ofdivergence of the mold boards. The fan wheels are constructed to affordsuf-- ficient clearance between the walls of the pivots 29. The plowunit, as shown,

funnels and the peripheries of the wheels, to permit of sliding thelatter outwardly to effect a disconnection from the motor, as explainedin the foregoing.

For the purpose of deflecting the snow to direct its delivery from thefan wheels, or, in other words, what may be termed snow ejectingdevices, to remote oints along the roadway, I provide'a semi-circularcoverplate 62 for each funnel, said plate having a port 63, locatedadjacent the upper portion of its surrounding edge. is provided atintervals along its edge with perforated outwardly extending flat lugs(33, adapted to engage flatwise with the inner side of the funnel. Boltholes adapted to receive bolts (34 are suitably placed to engage saidlugs, whereby the cover plate may be removably bolted in position. Eachcoverplate is provided with an outwardly and forwardly directeddeflector or hood (35, said hood being secured in such manner to theplate as to surround the top and sides of the port 63, the hoods of eachpreferably formed of sections such as a, b, c, and are hinged togetherby means of thumb screws 65, whereby the sections may be set at varyingangles to each other, to change the angle ofdeflection.

The adjustment screws 38 or what may be termed controlling means forcontrolling the position of the plow unit, are mounted on the links 23and bar 59, at a point located a short distance from the pivots 22 and29. This is done for convenience in construction, the screws beingsufliciently loose in the openings 39 and 39 to permit the plowunit toclimb an incline, independently of the tractor.

In Figure 10, 66 designates an incline, the nose of the plow being shownas sliding thereon, and the pivots 27 having been lifted from normalposition to a point located a considerable distance above the same.Bodily lifting of the plow unit in th1s manner is rendered possible byconstructing the rear ends of the struts to slidefreely on the axles 3 bproviding the plates 31. To facilitate c imbing hillocks or humps in theroad, I provide an adjustable shoe 67. The shoe comprises a flatbottomed plate, curved upwardly at its front end as at 67', and formedwith a bifurication 68, adapted to receive the flange forming the edgeof the ridge 24. A bolt 68 passes loosely through said flange and shoeto enable the latter to be swung in a vertical longitudinal plane. Theridge 24 is formed with a boss pierced by a vertically disposed bolthole (38", adapted to loosely receive a bolt 69 having a collar 70, saidcollar being adapted to engage the under side of the boss, to hold thebolt against longitudinal movement in the boss, but permit limitedlateral movement thereof in the hole 68".

Each coverplate The shoe is formed witha threaded lug 71, in which isthreaded the bolt 69, whereby it will be apparent that the bottomof theshoe may be held at selective distances from the bottom of the plowunit, as indicated by dotted lines in Figure 1. Thus, in surmounting icyhillocks, the shoe will ride over the same, while the plow unitconformingly rotates about the pivots 22 and the universal joint 56.

In operation, the plow unit is properly leveled with the roadbed byoperating the adjustment crank screws 38, it being apparent that theplow unit may be tilted laterally to conform to the crown of the roadbedby simply screwing one crank screw further in or out, as the case maybe, than the other. This is an important advantage in snow plows. Whenit is desired to remove the snow from the left side of the road, theplow may be positioned to bring its center line to the middle of theroad. The right hand shifting rod 50 is now operated to throw the righthand fan wheel out of gear. The hood is properly adjusted by means ofthe thumb screws 65', to throw the snow in the desired direction, onedirection being indicated by the arrows in Figures 1 and 2. As the fanwheels rotate from above forward, the snow scooped up by the left handmold board is forced through the port 63 into the arcuate chamber of thehood 65 and deflected by the latter to throw the snow a distancelaterally away from the snow plow. Thus, in a heavy snow fall, half ofthe road may be cleared at a time, there by enabling the use of the fullcapacity of the motor to drive one fan wheel, I have found this to be animportant advantage, in that a smaller tractor may be used, and betterwork performed, as well as efiecting a saving of time.

During a plowing operation, the nose of the plow may be quickly raisedby operating either or both of the crank screws 38, to avoid bad places,such as frozen spots, and the like. The ability of quick and accuratead'ustment, to raise or lower the plow unit ar itrarily at an easilyaccessible point at the side of thesnoW plow, as are the screws 38, isessential in snow lows, to render them practicable. By sliding theshafts 45 out of gear in the novel manner shown and described, I securea. cheap, simple, and effective construction. By making the coverplates62 readily removable, I am enabled to quickly prepare the plow for useon roads where throwing the snow to the side of the road is notnecessary. This is a eat advantage in snow plows, as muc motive power isthus conserved.

I claim:

1. A device of the class described comprising a tractor, a snow plowpropelled at the front thereof, means rigid with the front of saidtractor carrying a horizontal pivot, means connecting said plow to saidpivot, and means extending from said plow to the 1r-ear of said tractorand bearing against the atter.

2. In a snow plow, the combination with a trat tor having a drivenshaft; of a plow element adapted to plow snow, operatively mounted onthe front of the tractor and being formed with opposite laterallyopening funnels, drivable snow ejecting mechanism operatively connectedtosaid driven shaft to be driven thereby, said mechanism including arotary snow ejecting device in each of said funnels, and controllingmeans in connection with said devices and said driven shaft forarbitrarily disconnecting either or both from said shaft.

3. A device of the class described comprising a tractor, a snow plowpropelled at the front thereof, means rigid with the front of saidtractor carrying a horizontal pivot, means connecting said plow to saidpivot.

-1novable means connected to said plow and engaging the rear of saidtractor, and means for varying the distance between the pointofconnection of said last mentioned means with the plow and its point ofengagement with the tractor.

4. In a snow plow of the class described, the combination of a powerdriven wheeled frame, a pair of links extending longitudinally from thefront of the wheeled frame adjacent the top thereof, pivotal connectionsbetween said links and frame to enable the former to swing in a verticallongitudinal plane thereon, a plow unit pivotally connected at. itsforward portion to the front ends of said links to swing in a verticallongitudinal plane thereon, and brace members extendi from pointslocated near the rear of sald frame to said plow unit, and havingpivotal connection therewith to hold the same relatively positioned withrespect to the ground, and adjustment means for extending said bracemembers, for the purpose set forth.

5. In a snow plow, the combination of a motor driven wheeled frameincluding a driven shaft, a pair of laterally spaced links extendinglongitudinally from the front of the frame and having pivotal connectionwith the latter to swing in a vertical lon tudinal plane thereon, a plowpivoted to t e forward ends of said links to swing in a verticallongitudinal plane thereon, and brace members pivoted to the rearportion of said plow at a point located an appreciable distance belowthe recited pivotal connections of said links with said frame and adated to brace against a rear portion of saitf' wheeled frame and slideforwardly thereon, for the purpose set forth.

6. In a snow low, the combination of a wheeled frame liaving twoforwardly exapproximately in vertical alinement therewith, and extendingto the rear of the wheeled frame to brace against a portion thereof in amanner to hold the plow in plowing position, and manually operated meansfor arbitrarily varying the distance between said first named pivotalconnections and those of said brace members.

7. In a snow plow, the combination with a power driven wheeled framehaving a drivable shaft, of snow manipulating instrumentalitiespivotally connected to the front of said frame to swing'in a verticallongitudinal plane thereon, said manipulating instrumentalitiesincluding a. plow formed with a nose for initially en aging the snow androtary snow ejecting evices carried bythe plow having operativeconnection with said driven shaft to be driven thereby when the shaft isactuated, and brace members extending to a part .forming the rearportion of said wheeled frame to brace thereagainst and being locatedbelow the level of the pivotal connections between said frame andinstrnmentalities, and being connected to the latter in a manner to beapproximately in straight alinement with the nose of the plow.

8. In a snow plow, the combination with a motor driven tractor; of snowmanipulatmg devices operatively assembled to coact when actuated to plowthe snow and deposit the same at the s1de of the road, pivotally mountedon the front of the tractor to be swin'gable bodily in a verticallongitudinal plane thereon, said devices including a plow havlng a nosefor initially engaging with the snow, and rotary snow ejecting devicesoperatlvely connected with the motor of the tractor be driven thereby, a.bar bracing endwlse against a part of the tractor near the rear endthereof and extending in the direction of the nose of the plow, andbeing approximately in longitudinal alinement therewith, and secured tosaid plow, a p votable jolnt in said bar located intermediate its ends,and manually actuated means for bending said joint toselective degreesand so holding the same, for, the purpose set forth.

- 9. In a snow plow, the combination with a tractor havin a frameresiliently mounted to enable the front thereof to vibrate vertically,and a. motor carried by said frame, in-

eluding a driven shaft; of snow manipulating mechanism pivotally mountedon the front of said frame to be swingable bodily vertically thereonduring a snow manipulating operation, said snow manipulatmg mechanismincluding, a plow, braces extending from the tractor to the rear of theplow and being attached to the latter at points located between saidframe and the ground, for holding the plow in operative plowingposition, snow ejecting devices carried by the plow, having operativeconnection .withsaid driven shaft to be driven thereby, the pivotalconnection of the plow with said frame, including links extendingforwardly and having pivotable connection with the plow at a pointspaced an appreciable distance forwardly and u ward y of the point ofattachment of sai braces, for the purpose set forth.

10. In a snow plow, the combination with a power driven wheeled framehaving a driven shaft; of snow manipulating instrumentalities pivoted onthe front of said frame to swing bodilyvertically in a'longitudinalplane thereon, said instrumentalities including a plow, and rotarysnowejectm devices operatively connected with sai driven shaft to be driventhereby, said snow ejecting devices includi laterally ahned fan wheels,one for each side of the plow, a supporting shaft for each of said fanwheels, extending in alined relation transversely of said frame, a geartrain located between the .inner adjacent ends of said shafts andadapted to be connected with either, and having operative connectionwith said driven shaftto be driven thereby, and separate manuallyoperated controlling means for each of said shafts for arbitrarilyconnecting either of the latter with said gear train.

11. The combination with a vehicle having a wheeled supporting axle atthe rear thereof and a snow plow at the front thereof, a pair oflaterally spaced links pivotally connected to said frame and plow, and apair of laterally spaced links disposed, respectively, below said linkspivotally connected to the plow slidingly engaging and abutting the rearportion of said I vehicle.

12. The structure set forth in claim 11, said latter links havingflanges extending over the rear axle of said vehicle and slidablethereon, and shoulder portions extending substantially normal to saidflanges abutting said axle. 13. The structure set forth in claim 11, andmeans for separating the points of pivotal connection with said plow ofsaid mentioned links and said last mentioned 14. The combination with a.propelling vehicle, a snow plow connected to the front thereof, a thrustmeans connected to said plow and abutting against and longitudinallyslidable on the rear portion of said vehicle to take the backward thrustof said plow 15. The combination with a propelled vehicle having aframe, an axle at the rear thereof and driving wheels on said axle, of asnow plow at the front of said vehicle, means pivotally connecting saidsnow plow to the front of said frame, and means swingingly connected tosaid plow and abutting said axle.

16. The combination with the propelling vehicle of a snow plowcomprising a mold board having a Substantially pointed front portion andextending at each side of said portion, a pair of laterally spaced linksconnected to said mold board and said vehicle, a pair of laterallyspaced links pivotally connected to said mold board and abutting saidvehicle, means for moving said latter links to swing said mold boardabout the pivotal plow in front of said tractor movable about saidpivot, an articulated connection between said plow and the rear of saidtractor for moving said plow about said pivot.

18. A snow plow comprising side portions converging forwardlysubstantially in a point, a shoe adapted to engage and slide on theground adjacent the front of said plow, a threaded member engaging saidshoe and extending upwardly adjacent the front of said plow and adaptedto be turned to elevate the front of said plow relatively to said shoewhereby the plow front will be supported on said shoe.

In testimony whereof I afiix my signature.

JOHN O. JOHNSON.

